Process for the production of sound records



Patented Jan. 26, 1937 PROCESS FOR THE PRODUCTIbN OF SOUND RECORDS Gustav Kiigel, Baden-Baden, Germany No Drawing. Application March 27, 1936, Serial No. 71,336. In Germany November 24, 1934 15 Claims, (01. 274-46) The present invention relates to a process for the production of sound records by mechanical means, such as are employed, for example, in gramophone records, graphs, in television and for similar purposes.

An object'of the invention is a process for producing sound records on supports which consist of mixtures of glue, gelatine or similar colloids capable of being tanned and such light sensitive organic compounds'as acquire under the influence of light tanning properties with regard to the colloids employed, but in the dark are inert with regard to the said colloids. The term tanning is employed in this specification to mean,'as

is universally customary, the diminution of the capability of taking up moisture orof the solubilityof the colloids in moistening or solvent means respectively.

The supports described are provided vin the customary manner by engraving, incising or by similar mechanical treatment with relief-like records, whereupon the records are fixed by simple exposure to light. By this exposure to light, in addition to the solubility and capability of being moistened the mechanical properties of the material are also altered in a surprising'manner so thatthe material can be exceptionally well emrings, are suitable for use. Moreover, light sensitive carbonyl compounds, particularly quinones, may also be employed. Preferably the sulphonic acids of these compounds are used. Light sensipounds as are substituted by oxyalk-yl groups or by acid groups, such as, for example, sulpho-or carboxyl groups, for example the a-nitro-naphthalene derivatives which are substituted in the neighbouring position, i. aim the peri-or orthoposition to the nitro group, come particularly into consideration. If water soluble colloids are used,

such nitro compounds as are likewise soluble in water, such as, for example, l-nitronaphthalene- 8-sulphonic acid, 1-nitro-naphthalene-Z-sulphonic acid, l-nitro naphthalene-il-carboxylic acid, 1-nitro-naphthalene-3,8-disulphonic acid,

l-nitro-8-methyl-naphthalene-4-sulphonic acid,v

in telegraphing photoand which may possess still further substituents (such as, for example, halogens) may be employed. If colloids soluble in alcohol or hydrocarbons are used, 1-methyl-8-nitro-naphthalene and 1 nitro-naphthalene-8-carboxylic acid come, 5 for example, into consideration. Furthermore 7 light sensitive dyestufis, particularly xanthone dyestuifs, may be employed as sensitizing agents.

In order to attain the best possible evaluation of the sources of light just according to their spec- 10 troscopic constitution, mixtures of various light sensitive substances maybe employed if desired.-

As colloids capable of being tanned there may be employed, besides the gelatinous substances coming into consideration in the first place, also other albuminous substances, such as casein, furthermore collodion, asphalt, certain artificial resins, such as vinyl resins, and other substances. In known manner these substances may also be incorporated with materials such as graphite or metal dust. The mixtures of the colloids with the light sensitive substances. and the other additions are preferably dissolved in a solvent, for example, water, and are applied to suitable bases, for example metal plates, cardboard and so forth. If desired, the supports may be already pre-exposed before the working operation in order to alter the degree of hardness of the material; in this manner the degrees of hardness which always vary with difierent gelatine preparations can be equalized or compensated.

' -If desired the colloids capable of being tanned may be employed in admixture with waxes. In this manner supports are obtained, which can be sufliciently hardened by light and the particular advantage is further obtained that the adaptability for the mechanical working operation, particularly the adaptability for incising is better. By varying the quantity of wax it is possible to cause, as desired, either the adaptability for the Working operation or the capability of hardening to predominate. In order toobtain a suitable pouring solution it is necessary in this case to mix the colloid capable of being tanned and the wax with one another in a 501- vent which is adapted for association with the two materials or does form permanent dispersions with the two materials respectively. In the case where gelatine is'e'mployed as the colloid capable of being tanned and bees wax is employed as the wax, glycerine may, for example, be used as the solvent. Glycol may also be advantageously employed.

The following examples illustrate the invention:

(1) 1 litre of a 5% gelatine solution is mixed with 5 grams of eosine and 15 grams of thiosinamine, the mass obtained is cast into plates and dried. After the audition which is effected in known manner the plates are finished by expo- 5 sure to the light 01 an arc lamp for a period of, for example, a few minutes.

In place of the eosine, homologues, such, for

example, as erythosine, rose bengale, phloxine, cyanosine and others may be employed. (2) A solution of 100 grams of gelatine in 500 c. c.oi water is mixed with a solution of 20 grams of the magnesium salt of 1-nitro-naphthalene-8- sulphonic acid in 300 .c. c. 'of water. With the product thus obtained aluminium plates are coated, which are provided in the customary manner with sound records and are then exposed to light. In place of the magnesium salt of l-nitro-naphthalene-8-sulphonic acid the following compounds may also be employed: 1,2-nitronaphthalenesulphonic acid, 1,3,8-nitro-naphthalenedisulphonic acid, ortho-nitrobenzylalcohol, the sodium salt of -nitronaphthalene-1,8-dicarboxylic acid, the sodium salt of 1-nitronaphthalene-8-carboxylic acid. A further mixture which is suitable for use for the production of supports of sound records consists of 12 grams of the sodium salt of o-nitro-cinam'micacid, 140 grams of gelatine and 1000 c. c. of water.

(3) The procedure is carried out as in Example 2 but with the difference that instead of the gelatine solution mentioned in the said example casein plates or plates of agar-agar or albumins are employed as the starting material and the said plates are impregnated with the solutions of a light sensitive substance specified in Example 2.

(4) 100 grams of gelatine powder are mixed with c. c. ofglycerine and the mass is melted together in the water bath. After the addition of 20 grams or the magnesium salt of lnitronaphthalehe-S-sulphonic acid, 50 grams of bees wax are stirred in. A very fine emulsion is thereby obtained which is cast into plates. The working-up is carried out according to Example 1. Instead of the bees wax it is also possible toemploy, for example, Carnauba wax or Montan wax.

(5) 8 gram oi o-nitrophenylpropiolic acid and 100 grams of gelatine are dissolved in 1000 c. c. of water. The mixture is worked up according to Example 1.

(6) 3 grams of a phenanthrenequinonesulphonic acid, preierably a disulphonic acid, for example 2,7-phenanthrenequinone-disulphonic acid are dissolved together with 10 grams of gelatine in 120 c. c. of water and are cast into plates which are worked up according to Example 1. In place of the phenanthrenequinonesuiphonic acids the corresponding derivatives of pyroanthraquinone may be employed.

(7) A mixture oi! 100 grams of gelatine, 8 grams of the zinc chloride compound of diazotized 4-amino-1(N-methyl-S-naphthalenetetrahydride-1, 2, 3, 4) -aminobenzene, 20 grams of 50% acetic acid and 800 cc of water is applied to celluloid fllm. The strips are provided with records by mechanical means and are finished by exposure to light under a quartz lamp.

I claim:

1. A process for the production of sound records, which comprises mechanically producing records on supports comprising in a mixture colloids capable of being tanned and such light sensitive organic compounds as exert a tanning action in the light on the said colloids, and fixing the records by exposure to light.

2. A process for the production or sound records, which comprises engraving records on supports comprising in a mixture colloids capable of being tanned and such light sensitive organic compounds as exert a tanning action in the light on the said colloids, and fixing the records by exposure to light.

3. A process for the production of sound records, which comprises engraving records on supports comprising in a mixture colloids capable of being tanned and light sensitive dyestuffs, and fixing the record by exposure to light.

4. 'A process for the production of sound records, which comprises engraving records on supports comprising in a mixture colloids capable of being tanned and light sensitive xanthone dyestuffs, and fixing the record by exposure to light.

5. A process for the production of sound records, which comprises engraving records on supports comprising in a mixture colloids capable oi. being tanned and high molecular diazo compounds which contain at least three carbocyclic rings, and ,fixing the record by exposure to light. I '6. A process for the production of sound records, which comprises engraving records on supports comprising in a mixture colloids capable of being tanned and light sensitive nitro compounds, and fixing the record by exposure to light.

'7. A process for the production of sound records, which comprises engraving records on supports comprising in a mixture colloids capable of being tanned and a-nitro-naphthalene sulphonic acids, and fixing the record by exposure -to light.

8. A process for the production of sound records, which comprises engraving records on layers comprising colloids capable of being tanned and such light sensitive organic compounds as exert a tanning action in the light .on the said colloids, the said layers being supported by a base, and fixing the record by exposure to light.

9. The process which comprises engraving records on supports comprising colloids capable oi! being tanned and such light sensitive organic compounds as exert a tanning action in the light on the said colloids.

10. A phonograph record bearing engraved sound tracks, said record comprising a tanned colloid and the light decomposition product of such a light-sensitive organic compound as exerts a tanning action in the light on the untanned colloid.

11. A phonograph record bearing engraved sound tracks, said record comprising a tanned colloid and the light decomposition product or a light-sensitive dyestufl.

12. A phonograph record bearing engraved sound tracks, said record comprising a tanned colloid and the light decomposition product of a light-sensitive xanthone dyestufl.

13. A phonograph record bearing engraved soundtracks, said record comprising a tanned colloid and the light decomposition product of a high molecular diazo compound which contains at least three carbocyclic rings.

14. A phonograph record bearing engraved sound tracks, said record comprising a tanned colloid and the light decomposition product of a light-sensitive nitro'compound.

15. A phonograph record bearing engraved sound tracks, said record comprisinga tanned colloid and the light decomposition product 01 an alpha-nitro-naphthalene sulfonic acid.

oos'rav KGGEL. 

